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5x-2(4x-3)=-21
We simplify the equation to the form, which is simple to understand
5x-2(4x-3)=-21
Reorder the terms in parentheses
5x+(-8x+6)=-21
Remove unnecessary parentheses
+5x-8x+6=-21
We move all terms containing x to the left and all other terms to the right.
+5x-8x=-21-6
We simplify left and right side of the equation.
-3x=-27
We divide both sides of the equation by -3 to get x.
x=9
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